NDLI: Probabilistic Estimation in Soil Dynamic Properties to Obtain Response Spectra at Campeche Bay

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Joel, A. Garcia Vargas Gonza´lez, Antonio Ruvalcaba
Copyright Year	2003
Abstract	In the present study, response spectra for seismic design in the Bay of Campeche for offshore platforms, using probabilistic models in soil dynamic properties (shear modulus “G”, normalized shear modulus “G/Gmax” and damping ratio “D”), to evaluate their influence in the response of the site of interest, are presented. In this study the probabilistic model of the soil, take into account the uncertainty in soil dynamic properties, due to the fact that the soil dynamic properties play an important role on the interpretation of free-field motion. In this work an explicit form of the seismic wave characteristics were supposed and their likely source-site propagation characteristics were performed with two computer programs. In order to obtain seismic design parameters, three types of seismic event records were associated to the soil properties at the site of interest, taking into account local effect conditions. Geothechnical, seimologycal, tectonical and geological information, similar to the area of interest, were used. The maximum acceleration on the surface, the soil dominant period of vibration, the duration and the frequency content due to a dynamic excitation applied in the rigid base of the soil column were considered. We assumed that each one of the three types of earthquakes are representative of strong motions that might be potentially affecting the Bay of Campeche. In the study thirty-one sampling in several sites located at the Bay of Campeche were used as well as field and laboratory tests. The dynamic properties were determined in each test type by different ranges according to their shearing strain. From these results test, we know the G and D variation law in the range of interest. In the same way, the uncertainty level influence of the soil dynamic properties was modeled with the expected value of the soil dynamic properties. Six different sets including the soil modulus plus/minus a standard deviation, coefficient from the dynamic properties-time variant evaluations, for each one of the shearing strain, which are contained between 10−4 a 10, were considered. Expected site response spectra for different recurrence periods, may be used to complement available information in order to update the present seismic design spectra for offshore facilities located in this area.
Sponsorship	Ocean, Offshore, and Arctic Engineering Division
Starting Page	227
Ending Page	237
Page Count	11
File Format	PDF
ISBN	0791836827
DOI	10.1115/OMAE2003-37259
e-ISBN	079183672X
Volume Number	Volume 2: Safety and Reliability; Pipeline Technology
Conference Proceedings	ASME 2003 22nd International Conference on Offshore Mechanics and Arctic Engineering
Language	English
Publisher Date	2003-06-08
Publisher Place	Cancun, Mexico
Access Restriction	Subscribed
Subject Keyword	Uncertainty Response spectra Dynamic properties of the soil Soil Spectra (spectroscopy)
Content Type	Text
Resource Type	Article

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